1. Toward an axis, as in a sunflower; the oldest flowers are near the edge, the youngest in the centre

See also: centripetal

• plutonium bomb
• plutonium pit
• plutonium trigger
• plutonomy
• pluvial
• Pluvialis
• Pluvianus
• Pluvianus aegyptius
• pluviometer
• Pluviose
• ply
• plyboard
• plyer
• plyers
• Plymouth
• Plymouth Colony
• Plymouth Rock
• plywood
• Plzen
• PM
• PMS
• PMT
• pneumatic
• pneumatic caisson
• pneumatic drill